Telephone informant. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
Comments on the article
The proposed scheme (Fig. 1) is a simplified equivalent of autoresponders and informants.
(click to enlarge)
When you call, the pulse signal passes through the capacitance C 1 and the diode bridge VD3 on the relay K1. The relay is activated. Through contact K1.2, the power circuit of the tape recorder is closed. Contact K1.1 closes capacitance C1, and a constant voltage of 12 ... 14 V is applied to the relay and the circuit. The relay is self-locking. The intermittent signal generator on the DD1 chip and the threshold device on the DD2 chip are started. The signal from the generator is fed to the VT2 base, the load of which is the internal resistance of the telephone line. The operating time of the generator depends on the charge time of C7 through R7. The threshold device provides the desired operating time of the tape recorder, which depends on the charge time of C8 through R8 and R9. When the device is triggered, the transistor VT1 opens and "puts" the voltage on the relay. The relay releases, its contacts open, and the circuit goes into standby mode. The chain R1, R2, C2, C3, VD1, VD2 serves to equalize the signals in amplitude in the mode of recording a conversation on a tape recorder. It smoothly limits the signal with a higher amplitude. Resistance R3 limits the discharge current C1.
Details
The diode bridge VD3 must withstand a reverse voltage of 150 V. When using another relay, the capacitance C1 may need to be increased to 2 ... 3 microfarads. The circuit used the RES 9 relay with weakened return springs, which made it possible to reduce the operating current. You can use other relays with a winding resistance of 500 Ohm ... 1 kOhm and as little operating current as possible.
Transistors VT1 and VT2 - type npn for a maximum voltage of 60 V (KT604).
With proper installation, the device does not require adjustment.
Author: E. Rodionov, Minsk; Publication: N. Bolshakov, rf.atnn.ru
See other articles Section Telephony.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Artificial leather for touch emulation
15.04.2024
In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>
Petgugu Global cat litter
15.04.2024
Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>
The attractiveness of caring men
14.04.2024
The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>
| Random news from the Archive Garbage magnet in orbit
24.03.2021
A huge ELSA-d magnet was launched into Earth's orbit, the task of which is to collect metal space debris.
The Japanese-made device was launched into space using a satellite in which it was mounted. In the future, the magnet can become an effective "fighter" with debris. Devices of this type are launched into orbit for the first time.
The era of satellite constellations begins. Some of them may break and return to earth, and some may remain in space and evolve there, stumbling with other space devices. In addition to adding to the ranks of garbage, this will be a huge risk to the world's population.
The weight of the satellite is 200 kilograms. After garbage collection, it will burn up in the Earth's atmosphere, and all the data obtained in the future is used to produce a similar "ecosystem" of devices. It is known that the second research launch of the satellite will take place in 2023. The main positive factor of the device is its autonomy.
|
Other interesting news:
▪ Navigation module TESEO-LIV3F
▪ Budget chip for Jelly Bean from Broadcom
▪ Subminiature TransferJet Module
▪ Clouds are falling on Titan
▪ The first 60 satellites of the global Internet
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Stories from the life of radio amateurs. Selection of articles
▪ article Oven tablets from coal dust. Tips for the home master
▪ article Is the climate changing as a result of human activities? Detailed answer
▪ article Organization of a hinged crossing. Travel Tips
▪ article Depth of detection of objects by a metal detector. Encyclopedia of radio electronics and electrical engineering
▪ article Electrical equipment of cranes. Grounding and grounding. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese